1. Division of Pulmonary and Critical Care Medicine and
2. Department of Biostatistics, School of Public Health
3. Department of Medicine, and
4. Framingham Heart Study, Framingham, Massachusetts
5. Department of Radiology, Brigham and Women’s Hospital, Boston, Massachusetts
6. Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, Michigan
7. Medical Service and
8. Research Service, Veterans Affairs Ann Arbor Healthcare System, Ann Arbor, Michigan
9. Department of Medicine, National Jewish Health–Health Sciences Center, University of Colorado at Denver, Denver, Colorado
10. Center for Pulmonary Functional Imaging, Brigham and Women’s Hospital–Harvard Medical School, Harvard University, Boston, Massachusetts; and
11. Pulmonary Center, School of Medicine, Boston University, Boston, Massachusetts
12. Division of Pulmonary, Allergy, Sleep, and Critical Care Medicine, Boston Medical Center, Boston, Massachusetts